sr_rt.c

/*-----------------------------------------------------------------------------
 * file:  sr_rt.c
 * date:  Mon Oct 07 04:02:12 PDT 2002  
 * Author:  casado@stanford.edu
 *
 * Description:
 *
 *---------------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>


#include <sys/socket.h>
#include <netinet/in.h>
#define __USE_MISC 1 /* force linux to show inet_aton */
#include <arpa/inet.h>

#include "sr_rt.h"
#include "sr_router.h"

/*--------------------------------------------------------------------- 
 * Method:
 *
 *---------------------------------------------------------------------*/

int sr_load_rt(struct sr_instance* sr,const char* filename)
{
    FILE* fp;
    char  line[BUFSIZ];
    char  dest[32];
    char  gw[32];
    char  mask[32];
    char  iface[32];
    struct in_addr dest_addr;
    struct in_addr gw_addr;
    struct in_addr mask_addr;
    interface_t* intf;

    /* -- REQUIRES -- */
    assert(filename);
    if( access(filename,R_OK) != 0)
    {
        perror("access");
        return -1;
    }

    fp = fopen(filename,"r");
    struct sr_router* subsystem = (struct sr_router*)sr_get_subsystem(sr);


    while( fgets(line,BUFSIZ,fp) != 0)
    {
        printf("%s\n", line);
        sscanf(line,"%s %s %s %s",dest,gw,mask,iface);
        if(inet_aton(dest,&dest_addr) == 0)
        { 
            fprintf(stderr,
                    "Error loading routing table, cannot convert %s to valid IP\n",
                    dest);
            return -1; 
        }
        if(inet_aton(gw,&gw_addr) == 0)
        { 
            fprintf(stderr,
                    "Error loading routing table, cannot convert %s to valid IP\n",
                    gw);
            return -1; 
        }
        if(inet_aton(mask,&mask_addr) == 0)
        { 
            fprintf(stderr,
                    "Error loading routing table, cannot convert %s to valid IP\n",
                    mask);
            return -1; 
        }
       intf =  get_interface_name(subsystem, iface);
       if(intf == NULL) {
          fprintf(stderr,
                    "Error! Invalid interface: %s\n", iface);
       } else {
       rrtable_route_add( subsystem->rtable,
                       dest_addr.s_addr,
                       gw_addr.s_addr,
                       mask_addr.s_addr,
                       intf,
                       's' );

      }

    } /* -- while -- */

    return 0; /* -- success -- */
} /* -- sr_load_rt -- */